code: def export_unsqueeze_one_axis() -> None:
      x = np.random.randn(3, 4, 5).astype(np.float32)
  
      for i in range(x.ndim):
          axes = np.array([i]).astype(np.int64)
          node = onnx.helper.make_node(
              "Unsqueeze",
              inputs=["x", "axes"],
              outputs=["y"],
          )
          y = np.expand_dims(x, axis=i)
  
          expect(
              node,
              inputs=[x, axes],
              outputs=[y],
              name="test_unsqueeze_axis_" + str(i),
          )
  
file_path: onnx/onnx/backend/test/case/node/unsqueeze.py
imports: import numpy
  import onnx
  from onnx.backend.test.case.base import Base
  from onnx.backend.test.case.node import expect
label_desc: Use image node_id 1 for calling the Unsqueeze obj's underlying member method code with example usage: obj.export_unsqueeze_one_axis() without return types